Which adhesive for (polypropelene?) 2-stroke fuel tank?

Al Deveron wrote:
> On Thu, 20 Jul 2006 15:05:29 +0100, Al Deveron <wmth2581 DeleteThis @aol.com>
> wrote:
>
> Update:
> I just tried sticking it in with Superglue. It formed an incredibly
> strong joint (much stronger than Araldite did). I just hope that the
> 2-stroke fuel won't weaken it.
>
> Al D
>
Not unless it containsn nitromethane or acetone.

However CA comes in polythene bottles and its easy to break the dried
stuff away from it.


I have also used "liquid metal" to bond to polythene...it doesn't really
stick properly, but roughed up a bit first and forming a large fillet,
it ain't bad.
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

<meow2222.TakeThisOut@care2.com> wrote in message
news:1153411357.265916.36870@m79g2000cwm.googlegroups.com...
<snip>

> You might be able to reinstate the thread using one of those
> whatnots... a metal spiral, forget the name. Or maybe make a ring that
> screws in, and the tap screws into that. Etc.
<snip>

============================
'Helicoil' - I'm not sure if they work in plastic but worth asking from a
stockist.

Cic.



--
----------------------------------------
I am using the free version of SPAMfighter for private users.
It has removed 0 spam emails to date.
Paying users do not have this message in their emails.
Get the free SPAMfighter here: http://www.spamfighter.com/len
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

"Nick" <a RemoveThis @b.com> wrote in message
news:WdOvg.48207$Z61.13129@newsfe4-win.ntli.net...
> I would try a large diameter, short brass nut, washers and bolt into a
tight
> fitting hole with a "suitable-for-fuel rubber" washer each side - then
drill
> and tap the brass bolt and screw in the (or a new) petrol tap.
> This assumes you can get a nut into the right position and it will self
hold
> whilst tightening up ( use loctite ).
>
> If not, and this assumes the plastic is thick enough, drill and tap a
larger
> hole and either fit a petrol tap in direct, or a bolt which you can then
> drill and tap perhaps with a washer on the outside to strain relieve a
bit.
>
> Or as the others suggest - get a new or s/hand one but then thats not
> D-I-Y...
>
> Also depends on "what if it leaks" - a lawn mower/ outboard motor I
wouldn't
> worry so much, but if it leaks somewhere where vapours could collect, go
the
> new route.
>
> Nick
>
>
=======================
This might be a possible starting point:
http://www.screwfix.com/app/sfd/cat/pro.jsp?id=18109&ts=13268

It depends on what access there is through the filler cap.

Cic.



--
----------------------------------------
I am using the free version of SPAMfighter for private users.
It has removed 0 spam emails to date.
Paying users do not have this message in their emails.
Get the free SPAMfighter here: http://www.spamfighter.com/len
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

> HOt glue might work.
> Almost nothing sticks to polyolefins.

It won't. There is a Henkel / Loctite which will stick polyolefins when used
with a primer (Google). Although personally I would go down the "nsert with
a flange inside"route.
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

On Thu, 20 Jul 2006 19:02:14 +0100, The Natural Philosopher <a.DeleteThis@b.c>
wrote:

>HOt glue might work.

Thanks for the idea. That's something I hadn't thought of. Good idea
for "plan B" if the superglue fails.

Al D
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

On Thu, 20 Jul 2006 19:05:58 +0100, The Natural Philosopher <a.RemoveThis@b.c>
wrote:

>> I just tried sticking it in with Superglue. It formed an incredibly
>> strong joint (much stronger than Araldite did). I just hope that the
>> 2-stroke fuel won't weaken it.
>>
>> Al D
>>
>Not unless it containsn nitromethane or acetone.

I'm not sure what superglue contains apart from cynoacrylate...

>However CA comes in polythene bottles and its easy to break the dried
>stuff away from it.

I don't really know which plastic the petcock and the fuel tank are
made of. Anyway, the superglue made teh two stick together like s***
to a blanket. Touch wood, my problems are solved!

Cheers,

Al D
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

Al Deveron was thinking very hard :
> Advice please... I need to stick a plastic fuel tap into the hole in
> the bottom of a plastic 2-stroke fuel tank (the tank looks like
> polypropelene) on an outboard motor. The fuel tap was originally a
> screw-in job but a previous owner stripped the threads. I used
> Araldite last time, but it didn't hold very well.
>
> What adhesive should I try next? Superglue? I also have some Golden
> Hermatite. Perhaps that would work...

None will be effective I fancy.

You said late that the threads were damaged on both items. Could you
not take the tap along to a machinists shop and ask them to clean the
threads on the tap up or even tap it down to a slightly smaller thread
size?

Then ask them to make up a brass fitting - like a threaded nut with a
large flat shoulder on it. Cut out the treaded portion in the tank then
fit the above with a soft washer impervious to fuel. In other words
trap the tank firmly between the two parts.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

meow2222 DeleteThis @care2.com wrote :
> You might be able to reinstate the thread using one of those
> whatnots... a metal spiral, forget the name. Or maybe make a ring that
> screws in, and the tap screws into that. Etc.

Helicoil?

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

On Thu, 20 Jul 2006 15:05:29 +0100, Al Deveron <wmth2581 DeleteThis @aol.com> wrote:

>Advice please... I need to stick a plastic fuel tap into the hole in
>the bottom of a plastic 2-stroke fuel tank

Not a hope of gluing it, or of hot welding it.

Your best option is a screwed, flanged connector with a large flange on
each side and a wipe of petrol-proof elastic sealing compound on either
side (Oyltite is probably the best).

Or else replace it with a new tank, from a different engine if needs be.
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

"Al Deveron" <wmth2581 RemoveThis @aol.com> wrote in message
news:qv2vb2lcgni22rnedqmafrmfd9fig4l0mv@4ax.com...
>
> Advice please... I need to stick a plastic fuel tap into the hole in
> the bottom of a plastic 2-stroke fuel tank (the tank looks like
> polypropelene) on an outboard motor. The fuel tap was originally a
> screw-in job but a previous owner stripped the threads. I used
> Araldite last time, but it didn't hold very well.
>
> What adhesive should I try next? Superglue? I also have some Golden
> Hermatite. Perhaps that would work...

Loctite Plastix is supposed to bond all plastics. I tried it on a very small
part, but that didn't work. It might be OK on a relatively large item. Of
course, 100% cleanliness is a must.

Sylvain.
>
> Thank you.
>
> Al Deveron
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

The message <mlqvb2li6vquj5hdn7spv70u54sbp3iq24.DeleteThis@4ax.com>
from Pete C <petecnews.DeleteThis@gmail.com> contains these words:

> Some superglue activators use it so it might be worth trying one out
> on something made of PP, eg some ice cream tubs.

They're the ones with PP underneath the triangle with a 5 in it.

--
Skipweasel
Pay no attention to that man behind the curtain.
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

Al Deveron wrote:
> It wouldn't be the end of the world if it started to leak a drop or
> two every 30 minutes ro so, since it is an outboard motor hanging off
> the back of a boat.

But if it bursts into flames while you're bobbing up and down on the
high seas, wouldn't that be a trifle inconvenient?

Owain
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank? 

On Thu, 20 Jul 2006 18:06:53 +0100, Al Deveron <wmth2581.RemoveThis@aol.com>
wrote:

>On Thu, 20 Jul 2006 15:05:29 +0100, Al Deveron <wmth2581.RemoveThis@aol.com>
>wrote:
>
>Update:
>I just tried sticking it in with Superglue. It formed an incredibly
>strong joint (much stronger than Araldite did). I just hope that the
>2-stroke fuel won't weaken it.

If it is PP and superglue comes unstuck, have a look at this guide:

<http://www.loctite.us/int_henkel/loctite_us/index.cfm?&pageid=151&layout=2>

It recommends Loctite 770 as an activator, which *appears to be*
basically n-heptane:

<http://www.bmed.mcgill.ca/dept_resources/machine_shop/miscellaneous/msds/Loctite%20770%20Primer%20Prism.pdf>

Some superglue activators use it so it might be worth trying one out
on something made of PP, eg some ice cream tubs.

Another approach...

If the tap and tank *are* the same plastic and will soften and melt
with heat, another way to go could be to wind a coil of resistance
wire round the tap, put it in the tank and put a current through the
wire so it heats up and fuses the tap to the tank well. Once the
plastic is melted twisting the tap a little back and forth may help
this.

cheers,
Pete.
 >> Stay informed about: Which adhesive for (polypropelene?) 2-stroke fuel tank?